This fixes a bogus warning in bitmap.c by avoiding the problematic
transform of cunrolli, thereby eliding the elt->bits[0] test for
--disable-checking.
Bootstrapped (with and without --disable-checking) and tested on
x86_64-unknown-linux-gnu, applied.
Richard.
2018-11-21 Richard Biener <rguent...@suse.de>
PR bootstrap/88133
* bitmap.c (bitmap_last_set_bit): Refactor to avoid warning.
* Makefile.in (bitmap.o-warn): Remove again.
Index: gcc/bitmap.c
===================================================================
--- gcc/bitmap.c (revision 266340)
+++ gcc/bitmap.c (working copy)
@@ -1186,13 +1186,13 @@ bitmap_last_set_bit (const_bitmap a)
elt = elt->next;
bit_no = elt->indx * BITMAP_ELEMENT_ALL_BITS;
- for (ix = BITMAP_ELEMENT_WORDS - 1; ix >= 0; ix--)
+ for (ix = BITMAP_ELEMENT_WORDS - 1; ix >= 1; ix--)
{
word = elt->bits[ix];
if (word)
goto found_bit;
}
- gcc_unreachable ();
+ gcc_assert (elt->bits[ix] != 0);
found_bit:
bit_no += ix * BITMAP_WORD_BITS;
#if GCC_VERSION >= 3004
Index: gcc/Makefile.in
===================================================================
--- gcc/Makefile.in (revision 266340)
+++ gcc/Makefile.in (working copy)
@@ -221,7 +221,6 @@ libgcov-merge-tool.o-warn = -Wno-error
gimple-match.o-warn = -Wno-unused
generic-match.o-warn = -Wno-unused
dfp.o-warn = -Wno-strict-aliasing
-bitmap.o-warn = -Wno-error=array-bounds # PR 87926
# All warnings have to be shut off in stage1 if the compiler used then
# isn't gcc; configure determines that. WARN_CFLAGS will be either
